Question

这是我显示pickerview的代码。

 - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    UILabel *pickerLabel = (UILabel *)view;
    CGSize limitSize = CGSizeMake(300.0f, 50.0f);
    CGSize textSize;
    CGRect labelRect;

    switch ([pickerView tag]) {

        case 1: //Quiz picker
        {    
            //m_txtPurpose.text=@"Test";
            QuizGenre *quiz = [m_arrQuizGenre objectAtIndex:row];
            NSString *title = [quiz m_quizGenreName];
            textSize = [title sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:limitSize lineBreakMode:UILineBreakModeWordWrap];
            labelRect = CGRectMake(0, 0, textSize.width, textSize.height);
            NSLog(@"length:%i title:%@",[title length],title);
            NSLog(@"h:%f w:%f",textSize.height,textSize.width);
            if (pickerLabel == nil)
            {
                pickerLabel = [[[UILabel alloc] initWithFrame:labelRect] autorelease];
                [pickerLabel setFont:[UIFont systemFontOfSize:14]];
                [pickerLabel setBackgroundColor:[UIColor clearColor]];
                [pickerLabel setLineBreakMode:UILineBreakModeWordWrap];
                [pickerLabel setTextAlignment:UITextAlignmentCenter];
                [pickerLabel setText:title]; 
                [pickerLabel setNumberOfLines:3];


            }

            break;  
        case 2:  //Purpose picker
            {
                //cost.text = @"ABC";
                Purpose *prp = [m_arrPurpose objectAtIndex:row];
                NSString *title = [prp m_purposeName];
                textSize = [title sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:limitSize lineBreakMode:UILineBreakModeWordWrap];
                labelRect = CGRectMake(0, 0, textSize.width, textSize.height);
                NSLog(@"length:%i title:%@",[title length],title);
                NSLog(@"h:%f w:%f",textSize.height,textSize.width);
                if (pickerLabel == nil)
                {
                    pickerLabel = [[[UILabel alloc] initWithFrame:labelRect] autorelease];
                    [pickerLabel setFont:[UIFont systemFontOfSize:14]];
                    [pickerLabel setBackgroundColor:[UIColor clearColor]];
                    [pickerLabel setLineBreakMode:UILineBreakModeWordWrap];
                    [pickerLabel setTextAlignment:UITextAlignmentCenter];
                    [pickerLabel setText:title]; 
                    [pickerLabel setNumberOfLines:3];


                }
                break;
            default:

                break;
            }

        }
    }
    return pickerLabel;
}

我的Picker视图在第6行后显示错误的值。我的测验选择器视图中有13个值。像测验类型：1＆gt;艺术2＆gt;地理3＆gt; <13的一般知识>电视。在第6个值之后，它从第一个记录开始。这是图像

Wrong Value in picker snapshot

他们应该展示一些像这样的东西。电影，音乐，电视，政治等等。我们将不胜感激。感谢

Answer 1

我找到了解决此问题的正确方案。这段代码正在做的是在六条记录之后刷新了选择器并且这个条件“if（pickerLabel == nil）”变得错误因此它重复了相同的记录。我曾经将这行代码复制到其他部分，以及它对我的工作正常。

 else{
                [pickerLabel setFont:[UIFont systemFontOfSize:14]];
                [pickerLabel setBackgroundColor:[UIColor clearColor]];
                [pickerLabel setLineBreakMode:UILineBreakModeWordWrap];
                [pickerLabel setTextAlignment:UITextAlignmentCenter];
                [pickerLabel setText:title]; 
                [pickerLabel setNumberOfLines:3];
      }

对于像我这样面临同样问题的人来说，这可能会有所帮助。

在iphone应用程序中的PickerView中显示不正确的值。

1 个答案: